Emeey paekee



UNITED STATES PATENT. OFFICE.

EMERY PARKER, OF NEW BRITAIN, CONNECTICUT.

K EY.

SPECIFICATION forming part of Letters Patent No. 239,668, dated April 5,1881.`

' Application Flea February 16,1880.

To all whom it may concern Beit known that I, EMERY PARKER, of NewBritain, in the county of Hartford and State of Connecticut, haveinvented certain-new and useful Improvements in Lock-Keys 5 and I dohereby declare that the following is a full, clear, and exactdescription thereof, whereby a person skilled in the art can make anduse the same, reference being had to the accompanyro ing drawings, andto the letters ot' reference marked thereon.

Like leters in the figures indicate the same parts.

My improvementrelates to the nianufacture of a new form of lock-key,such as is used for the locks of' doors, drawers, Src.

The object of my invention is to provide a more easily constructed keythan has heretofore been in use, by making it of plate or sheet metal,in the manner. described.

In the accompanying drawings, Figure l shows the flat side ot' ablankcut out from plate metal, from which my improved key is formed.Fig. 2 shows an edge view of the same. Fig. shows a side .view of myimproved key when finished. Fig. 4 shows a top or back view of the same.Fig. 5 showsa sect-ion through the key on the line x y of Figs. 3 and 4.

In making myimproved key a blank is first cut out from a piece of platemetal, as shown in Figs. l and 2.

Ais the part which forms the ring andA by means of suitable tools ormachinery. The

part B is reduced in thickness and made considerably thinner than theparts of the blank forming the bit and handle. This permits its beingbent round into the cylindrical form with greater facility, and alsopermits a sharper angle between it and the bit, so as to bring the bitexactly into the middle of the key.

C is the part which forms the bit.

D is a projection raised upon the blank by striking it up from below, asshown in Fig. 2. This is for the purpose of forming the projectingshoulder shown at a in Figs. 3 and 4. The projection D can be struck upfrom the blank while it is dat, or when the stem is partially bentround.

When the part B of the blank is bent into a' cylindrical form round amandrel having a; 5 5 taper point, the edges meet on the lower sidealong the base of the bit C, as seen in Figs. 3, 4, and 5. The forwardor most salient part of the projection D is slightly drawn downward bythe curving oi' the stem, sothat it remains in the line ot' the top edgeof the handle and forms the shoulder which prevent-s the key from beinginserted too far into the lock. The corresponding lower shoulder, a,isformed by the lateral projections upon the edges of the blank.

The edge ofthe blank at B is thinned down so that it will lie close -tothe side of the flat handle, and the proper form is given to the wholekey by hammering or pressing the metal upon a pointed mandrel insertedinto the hollow of the stem. lhe bit is bent so as to come in the middleofthe key, and the whole is tinished and made symmetrical upon the twosides by hammering or being struck in suitable dies.

v My invention is especially' adapted to the production ofsteel keys,which shall be both strong and light, and which shall, at the same time,have a suitable round stem or barrel, for supporting it, as an axis,when turning in the lock.

My improvement is also adapted to both stem and pin keys. For the formerthe end ot' the stem is spun down, or the edges turned over, until theymeet in the center and close the opening in the end. For the latter theAhole is left open for the reception of the. pin attached to the lock.In this case the projecting part of the stem beyond the bit can bedispensed with.

The joint in the metal formed by the union ofthe edges of the blank bentround to form the stem can be brazed or soldered, or the joint can bemade so closeasnot to be observed. Where the metal used is suiicientlystrong, as in the case of steel, the brazing can be omitted.

What I claim as my invention is- In a blank fora sheet-metal key, theprojection D, constructed as described, and forming, in the finishedkey, a shoulder, a, corresponding to the shoulder a upon the oppositeside thereof, substantially as described.

EMERY PARKER.

IOO

Witnesses:

THEO. G. ELLIS, WILMOT HoaToN.

